Docker network not found affected user or permission response

When this happens

Use this when admin accounts work but a real user or integration account fails. Do not stop at the screen message; validate the actor, role, group, owner, token, and permission boundary first.

Symptom checklist

• network not found appears repeatedly in the Docker UI or logs.
• logs, exit code, volume, network, port bind differs between successful and failed requests.
• The issue appears only after separating image issue from runtime environment issue.
• It often follows deploys, permission changes, configuration edits, or data refreshes.

Likely causes

• network not found specifically changes the investigation surface for Docker: verify the exact failing object, route, user, and timestamp before applying the broader pattern.
• The requested path reaches a server block, ingress, or router that does not own it.
• A rewrite or permalink rule captures the route before the intended handler.
• Static output, submodule content, or uploaded files were not deployed.
• The host header maps to a default virtual host instead of the target site.
• A cache serves an old 404 after the route has been added.
• For the affected user or permission case, the first useful clue is the actor, role, group, owner, token, and permission boundary.

First 1-minute checks

1. Write down the first failure time, latest change, affected user, path, and object ID.
2. Compare logs, exit code, volume, network, port bind for success and failure in the same window.
3. Test the hypothesis: routing failure caused by missing route, wrong virtual host, rewrite rule, permalink cache, ingress rule, or missing deployed file.
4. Classify this as affected user or permission: the actor, role, group, owner, token, and permission boundary.
5. Capture current values before changing configuration.

First evidence

Treat network not found as a affected user or permission case. First collect evidence for the actor, role, group, owner, token, and permission boundary.

Output examples

Normal output

The same action succeeds for the same role and target object.

Failing output

Only one user, group, owner, token, or object path fails.

Output-to-action branches

• Admin accounts work but a real user or integration account fails.
  Verify as the affected actor and grant the smallest missing permission or restore ownership.
• The working and failing outputs differ.
  Act on the differing layer first: For network not found, apply the fix only after reproducing the same condition and saving the before/after evidence for this exact code.
• Command output is normal but users still fail.
  Separate browser cache, cookies, permissions, and network location before declaring it fixed.

Do not do this

• Do not solve it by giving broad administrator access.
• Do not change multiple layers before identifying the failing layer.
• Do not delete production data, grant broad permissions, or disable security controls as a first response.

Evidence quality

Auto-generated operator draft: includes issue-specific causes, commands, output branches, and unsafe-action warnings. Official-source links and real incident validation are queued for enrichment.

Commands to run first

grep -R "network not found" ./logs

docker ps -a

docker logs CONTAINER --tail 200

docker inspect CONTAINER

docker compose config

curl -I https://example.com/missing-path

grep -R "404\|not found\|rewrite\|permalink" ./logs

nginx -T | grep -n "server_name\|rewrite\|location"

grep -R "permission\|denied\|unauthorized\|forbidden\|owner" ./logs | tail -n 80

Fix order

1. Record the full network not found message, failing URL, user, object ID, and latest change.
2. Collect issue-specific evidence for routing failure caused by missing route, wrong virtual host, rewrite rule, permalink cache, ingress rule, or missing deployed file.
3. Compare the failing case with a successful case before editing settings.
4. If this is the affected user or permission branch, Verify as the affected actor and grant the smallest missing permission or restore ownership.
5. Re-check with the same command and URL, then record the normal output.

Actions by cause

• For network not found, apply the fix only after reproducing the same condition and saving the before/after evidence for this exact code.
• Check host and path routing before changing application code.
• Print rewrite, ingress, or server configuration and verify rule order.
• Confirm the built artifact actually contains the expected file or route.
• Purge CDN and application route cache after fixing the origin route.
• Add a regression URL check for the exact failing path.
• For the affected user or permission branch, Verify as the affected actor and grant the smallest missing permission or restore ownership.

Evidence links

• Docker troubleshooting official
• Docker Compose reference official

Verification metadata

• operator-draft
• official-reference-linked
• 2026-07-23

Update queue

• Review cadence
  weekly-source-review
• Next enrichment
  Add one official-source check and one real output example for Docker network not found.

Environment-specific checks

• Shared hosting, proxies, VPNs, or CDN layers can change image issue from runtime environment issue results.
• Do not trust only the Docker UI; compare command output.
• Japanese hosting panels may show completion before DNS or SSL fully propagates.
• Test from both office and external networks.

Prevent it next time

• Store normal examples for logs, exit code, volume, network, port bind.
• Add volume permissions, port conflicts, image tag, healthcheck to the release checklist.
• Keep recurring errors in the same note format.
• Split alerts by error rate, latency, certificates, disk, and permission changes.

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